• 6001 Broken Sound Pkwy NW
  • Suite 610
  • Boca Raton , FL 33487

Water Treatment Plant Miscellaneous Improvements

  • January 13, 2020
  • Globaltech

We are happy to announce the completion of our miscellaneous improvements project in Boca Raton, Florida. Palm Beach County Water Utilities Department (PBCWUD) requested to implement several improvements at Water Treatment Plant (WTP) 9. Globaltech was hired to design and construct the improvements. Proposed work included replacing a portion of the raw water ductile iron piping (DIP), stainless-steel (SST) static mixer, rehabilitation of the concrete within the static mixer vault, installing a new sulfuric acid dilution system, a new diesel exhaust fluid (DEF) bulk storage tank and delivery system for the plant generator’s DEF day tank, and a new corrosion inhibitor tank.

Raw Water Main Piping Replacement & Acid Feed

Due to the proximity of the existing acid injection point, the raw water DIP influent line became damaged and needed to be replaced. The new piping was placed upstream of the static mixer with SST flanged pipe and the SST static mixer. Additionally, rehabilitation of the static mixer vault included concrete repair and an epoxy acid resistant coating applied to the floor and walls.

A new exterior acid dilution system was installed consisting of two new raw water dilution pumps, a hurricane-rated enclosure with chemical-resistant piping and two static mixers for dilution of the sulfuric acid as well as new piping to the injection points. The raw water used for dilution was provided by a new tap on the 36-inch diameter raw water DIP influent line, routed to the new pumps and used for diluting 93% sulfuric acid. The diluted sulfuric acid is then fed to the new 36-inch SST static mixer with new ethylene chlorotrifluoroethylene (ECTFE) carrier piping. Monitoring and control of the dilution system has been programmed into the plant’s supervisory control and data acquisition (SCADA) system.

DEF Bulk Storage Tank & Corrosion Inhibitor Tank

The recent addition of a Tier IV generator required a DEF additive to meet environmental compliance. DEF is a solution consisting of 32.5% urea and 67.5% deionized water. Globaltech furnished and installed a new climate-controlled 2,000-gallon DEF bulk tank located adjacent to the generator building to provide adequate DEF for long periods during possible power-outages. The DEF bulk tank is housed inside a climate-controlled enclosure to protect the life of the DEF. Inside the bulk tank are two submersible pumps that automatically transfer DEF to the day tank when the day tank reaches a low-level. The existing day tank level instruments were used for the high- and low-level signal. The day tank and bulk tank DEF levels are monitored using the plant’s SCADA system and also visible locally at each location. At the day tank, a transfer pump was installed to remove DEF from the day tank and send it back to the newly installed 2,000-gallon tank, if required.

In addition to the bulk DEF system, there was a need to remove some aging equipment. The existing smaller Corrosion Inhibitor steel tank was replaced with a new 1,500-gallon FRP tank and included a physical site gauge for local level measurements in addition to an ultrasonic level indicator that is visible through the plant’s SCADA system.